Link to Cached version missing

The title is there, the description is there too...

[dave741]

The results in SERPs look usally like this:

My Greeat company
The description of my great company.
www.example.com/ - Cached - Similar pages

But in my case is the link to Cached version missing. So it looks lkie this:

My Greeat company
The description of my great company.
www.example.com/ - Similar pages

Do you have any ides why?